Integrated circuit and operation method thereof

ABSTRACT

An integrated circuit includes a driving circuit and an enable control circuit. The driving circuit is configured to perform a setup operation based on a first driving current and perform a preset operation, using different driving currents, based on a first enable signal and a second enable signal. The enable control circuit is configured to generate the first and second enable signals.

CROSS-REFERENCES TO RELATED APPLICATION

The present application claims priority under 35 U.S.C. § 119(a) to Korean application number 10-2021-0060058, filed on May 10, 2021, in the Korean Intellectual Property Office, which is incorporated herein by reference in its entirety.

BACKGROUND 1. Technical Field

Various embodiments generally relate to an integrated circuit and an operation method thereof, and more particularly, to an integrated circuit which operates based on an enable signal, and an operation method thereof.

2. Related Art

In general, an integrated circuit including a semiconductor device and a semiconductor memory device is designed to perform various operations. The integrated circuit uses a voltage, applied from outside the circuit, as a power source to perform various operations. In particular, the semiconductor memory device receives command information, address information, and data information as well as the voltage applied from outside the circuit, and performs read and write operations on the data information.

Recently, the integrated circuit is designed to consume a small amount of power. Therefore, a plurality of internal circuits installed in the integrated circuit are each designed to be enabled when the corresponding circuit is needed, and disabled when the corresponding circuit is not needed. When an internal circuit is enabled, it indicates that the internal circuit performs a preset operation through power consumption. Furthermore, when an internal circuit is disabled, it indicates that power is not consumed because the internal circuit does not perform a preset operation. In this way, the integrated circuit minimizes the amount of power consumed therein by controlling the enabled and disabled states of each internal circuit.

Furthermore, the integrated circuit gradually lowers the voltage level of an internal voltage used therein, in order to reduce the power consumption. However, such an internal voltage having a low voltage level causes various problems during an enable operation of enabling an internal circuit. One of the problems is associated with a setup operation for an internal circuit.

In other words, an internal circuit performs a preset normal operation through the enable operation. In order for the internal circuit to perform a normal operation, a stable setup operation needs to be guaranteed in an enable initial period for the internal circuit. However, an internal circuit using an internal voltage having a low level may not be guaranteed with a stable setup operation. Therefore, research and development needs to be conducted on various methods for guaranteeing an internal circuit with a stable setup operation.

SUMMARY

In an embodiment, an integrated circuit may include: a driving circuit enabled based on a first enable signal and a second enable signal, and configured to perform a setup operation based on a first driving current and perform a preset operation based on a second driving current lower than the first driving current; and an enable control circuit configured to generate the first and second enable signals.

In an embodiment, an integrated circuit may include: a first input buffer circuit capable of being enabled based on a first enable signal and a second enable signal, the first input buffer circuit configured to perform a setup operation based on a first driving current and buffer input information based on a second driving current lower than the first driving current; a second input buffer circuit capable of being enabled based on a third enable signal and a fourth enable signal, the second input buffer circuit configured to perform a setup operation based on a third driving current and buffer falling data of the input information based on a fourth driving current lower than the third driving current; an output circuit configured to output output information corresponding to output signals of the first and second input buffer circuits; and an enable control circuit configured to generate the first, second, third, and fourth enable signals.

In an embodiment, an operation method of an integrated circuit may include: performing a setup operation using a first driving current in an enable initial period; and performing a preset driving operation using a second driving current lower than the first driving current, after the setup operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating a configuration of an integrated circuit in accordance with an embodiment,

FIG. 2 is a diagram illustrating an integrated circuit in accordance with an embodiment.

FIG. 3 is a timing diagram illustrating an operation of an enable control circuit of FIG. 2 .

FIG. 4 is a diagram illustrating an integrated circuit in accordance with an embodiment.

FIG. 5 is a timing diagram illustrating an operation of an enable control circuit of FIG. 4 .

FIG. 6 is a circuit diagram illustrating an integrated circuit in accordance with an embodiment.

FIG. 7 is a timing diagram illustrating an operation of an enable control circuit of FIG. 6 .

FIG. 8 is a flowchart illustrating an operation method of an integrated circuit in accordance with an embodiment,

DETAILED DESCRIPTION

The description of the present disclosure is an embodiment for a structural and/or functional description. The scope of rights of the present disclosure should not be construed as being limited to embodiments described in the specification. That is, the scope of rights of the present disclosure should be understood as including equivalents, which may realize the technical spirit, because an embodiment may be modified in various ways and may have various forms. Furthermore, objects or effects proposed in the present disclosure do not mean that a specific embodiment should include all objects or effects or include only such effects. Accordingly, the scope of rights of the present disclosure should not be understood as being limited thereby.

The meaning of the terms that are described in this application should be understood as follows.

The terms, such as the “first” and the “second,” are used to distinguish one element from another element, and the scope of the present disclosure should not be limited by the terms. For example, a first element may be named a second element. Likewise, the second element may be named the first element.

An expression of the singular number should be understood as including plural expressions, unless clearly expressed otherwise in the context, The terms, such as “include” or “have,” should be understood as indicating the existence of a set characteristic, number, step, operation, element, part, or a combination thereof, not excluding a possibility of the existence or addition of one or more other characteristics, numbers, steps, operations, elements, parts, or a combination thereof.

In each of the steps, symbols (e.g., a, b, and c) are used for convenience of description, and the symbols do not describe an order of the steps. The steps may be performed in an order different from the order described in the context unless a specific order is dearly described in the context. That is, the steps may be performed according to a described order, may be performed substantially at the same time as the described order, or may be performed in reverse order of the described order.

the terms used herein, including technological or scientific terms, have the same meanings as those that are typically understood by those skilled in the art, unless otherwise defined. Terms defined in commonly used dictionaries should be construed as having the same meanings as those in the context in related technology and should not be construed as having ideal or excessively formal meanings, unless dearly defined in the application.

Various embodiments are directed to an integrated circuit capable of quickly performing a setup operation in an enable initial period based on an enable signal, and an operating method thereof.

FIG. 1 is a block diagram illustrating a configuration of an integrated circuit 100 in accordance with an embodiment.

Referring to FIG. 1 , the integrated circuit 100 may include a driving circuit 110 and an enable control circuit 120,

First, the driving circuit 110 may be enabled based on first and second enable signals EN_1 and EN_2. The driving circuit 110 may perform a setup operation based on a first driving current. The driving circuit 110 may perform a preset operation based on a second driving current lower than the first driving current. The driving circuit 110 may include one or more internal circuits among a plurality of internal circuits included in the integrated circuit 100. The driving circuit 110 may be an internal voltage generation circuit, an input buffer circuit, or the like, for example. Although described below with reference to FIG. 3 , the driving circuit 110 may perform the setup operation in an enable initial period, and perform the preset operation after the enable initial period.

The enable control circuit 120 may be configured to generate the first and second enable signals EN_1 and EN_2 based on a source enable signal EN_S. The source enable signal EN_S may be generated outside or inside the integrated circuit 100, and serve as a signal for controlling an enable operation of the driving circuit 110. The first enable signal EN_1 may be enabled in response to a setup operation period and a preset operation period of the driving circuit 110. The second enable signal EN_2 may be enabled in response to the setup operation period of the driving circuit 110. The source enable signal EN_S, the first enable signal EN_1 and the second enable signal EN_2 will be described below in more detail with reference to FIG. 3 .

Through such a configuration, the integrated circuit 100 may generate the first and second enable signals EN_1 and EN_2 which are enabled to overlap each other in the setup operation period of the driving circuit 110. In an embodiment, the first and second enable signals EN_1 and EN_2 overlapping each other in the setup operation period means the first and second enable signals EN_1 and EN_2 are each enabled in the setup operation period. Furthermore, the integrated circuit 100 may perform the setup operation through the first driving current which is driven based on the first and second enable signals EN_1 and EN_2. The first driving current may have a larger drivability than the second driving current which is driven during the preset operation of the driving circuit 110. Therefore, in the enable initial period, the driving circuit 110 may perform the setup operation at higher speed, based on the first driving current.

The integrated circuit 100 may perform the setup operation through the first driving current in the enable initial period.

FIG. 2 is a diagram illustrating an integrated circuit 200 in accordance with an embodiment. FIG. 2 illustrates an example in which the driving circuit 110 of FIG. 1 is an internal voltage generation circuit 210 to generate an internal voltage V_INN.

Referring to FIG. 2 , the integrated circuit 200 may include the internal voltage generation circuit 210 and an enable control circuit 220.

The internal voltage generation circuit 210 may be enabled based on first and second enable signals EN_1 and EN_2, and configured to generate the internal voltage V_INN. More specifically, the internal voltage generation circuit 210 may include a voltage driving circuit 211 and an enable circuit 212.

The voltage driving circuit 211 may be configured to generate the internal voltage V_INN. The voltage driving circuit 211 may be implemented in various manners depending on design. The voltage driving circuit 211 may include all circuits that can receive first and second driving currents and generate the internal voltage V_INN, based on the first and second enable signals EN_1 and EN_2.

The enable circuit 212 may be configured to control the enable operation of the voltage driving circuit 211 based on the first and second enable signals EN_1 and EN_2. More specifically, the enable circuit 212 may include a first NMOS transistor NM1 and a second NMOS transistor NM2.

The first NMOS transistor NM1 may have drain and source terminals coupled between the voltage driving circuit 211 and a ground voltage terminal VSS. The first NMOS transistor NM1 may have a gate terminal configured to receive the first enable signal EN_1. Thus, the first NMOS transistor NM1 may be turned on or off based on the first enable signal EN_1.

The second NMOS transistor NM2 may have drain and source terminals coupled between the voltage driving circuit 211 and the ground voltage terminal VSS. The second NMOS transistor NM2 may have a gate terminal configured to receive the second enable signal EN_2. Thus, the second NMOS transistor NM2 may be turned on or off based on the second enable signal EN_2.

As described with reference to FIG. 1 , the first and second enable signals EN_1 and EN_2 may be enabled to overlap each other in the enable initial period. In other words, the first and second NMOS transistors NM1 and NM2 of the enable circuit 212 may be both turned on in the enable initial period. Therefore, the voltage driving circuit 211 may quickly perform the setup operation using the first driving current higher than the second driving current in the enable initial period.

Although described below with reference to FIG. 3 , the second enable signal EN_2 may be disabled after the enable initial period. In other words, the second NMOS transistor NM2 may be turned off after the enable initial period. Therefore, the voltage driving circuit 211 may perform the operation of generating the internal voltage V_INN using the second driving current lower than the first driving current after the enable initial period.

The enable control circuit 220 may be configured to generate the first and second enable signals EN_1 and EN_2 based on a source enable signal EN_S. More specifically, the enable control circuit 220 may include a delay circuit 221 and an output circuit 222.

The enable control circuit 220 may output, as the first enable signal EN_1, the source enable signal EN_S to control an enable operation of the internal voltage generation circuit 210. The delay circuit 221 may be configured to delay the first enable signal EN_1 by a preset time, and output the delayed signal. The delay circuit 221 may finally generate an inverted and delayed first enable signal EN_1BD by delaying and inverting the first enable signal EN_1 by the preset time. The preset time may correspond to the setup operation period for the voltage driving circuit 211.

The preset time of the delay circuit 221 may be controlled based on skew information INF_SQ. The skew information INF_SQ may include characteristic information of the transistors, based on a process, voltage, and temperature which are reflected in the integrated circuit 200. Therefore, the preset time of the delay circuit 221 may be controlled according to the process, voltage, and temperature which are reflected in the integrated circuit 200. As described above, the preset time may correspond to the setup operation period of the voltage driving circuit 211. In other words, the delay circuit 221 may control the setup operation period of the voltage driving circuit 211 according to the process, voltage, and temperature which are reflected in the integrated circuit 200.

The output circuit 222 may be configured to receive the first enable signal EN_1 and the inverted and delayed first enable signal EN_1BD which is an output signal of the delay circuit 221, and output the second enable signal EN_2 having a pulse width corresponding to the preset time. The output circuit 222 may include an AND circuit AND configured to receive the first enable signal EN_1 and the inverted and delayed first enable signal EN_1BD, perform an AND operation on the received signals, and output the operation result as the second enable signal EN_2.

FIG. 3 is a timing diagram illustrating the operation of the enable control circuit 220 of FIG. 2 .

FIG. 3 illustrates the source enable signal EN_S, the first enable signal EN_1 the inverted and delayed first enable signal EN_1BD, and the second enable signal EN_2.

Referring to FIGS. 2 and 3 , the source enable signal EN_S may be enabled while transitioning to a logic ‘high’ level from a logic ‘low’ level at which the source enable signal EN_S is disabled. The first enable signal EN_1 may correspond to the source enable signal EN_S. Like the source enable signal EN_S, the first enable signal EN_1 may be enabled while transitioning from a logic ‘low’ level to a logic ‘high’ level. When the first enable signal EN_1 is enabled, the first NMOS transistor NM1 of FIG. 2 may be turned on.

The first enable signal EN_1 may be outputted as the inverted and delayed first enable signal EN_1BD through the delay circuit 221 of FIG. 2 . The output circuit 222 of FIG. 1 may generate the second enable signal EN_2 by performing an AND operation on the first enable signal EN_1 and the inverted and delayed first enable signal EN_1BD. The second enable signal EN_2 may have an enable period in which the second enable signal EN_2 overlaps the first enable signal EN_1 in the enable initial period. When the second enable signal EN_2 is enabled, the second NMOS transistor NM2 of

FIG. 2 may be turned on.

Therefore, the voltage driving circuit 211 of FIG. 2 may quickly perform the setup operation using a large amount of driving current in an enable period tST in which the first and second enable signals EN_1 and EN_2 overlap each other. That is, the voltage driving circuit 211 may perform a stable setup operation in the enable period tST. Then, the second NMOS transistor NM2 may be turned off based on the second enable signal EN_2. Therefore, the voltage driving circuit 211 may normally generate the internal voltage V_INN using a low driving current after the stable setup operation.

The integrated circuit 200 in accordance with the present embodiment may secure sufficient driving current at which the voltage driving circuit 211 can perform the setup operation based on the first and second enable signals EN_1 and EN_2.

Referring back to FIG. 2 , the integrated circuit 200 may generate the first and second driving currents by controlling the enable periods of the first and second enable signals EN_1 and EN_2 to overlap each other. In order to generate the first and second driving currents, various circuit configurations may be applied. For example, the first NMOS transistor NM1 may be designed to generate the second driving current when turned on, and the second NMOS transistor NM2 may be designed to generate the first driving current when turned on. In this case, the first enable signal EN_1 may be designed as a signal which is enabled after the setup operation period. Therefore, the enable circuit 212 may provide the first driving current to the voltage driving circuit 211 based on the second enable signal EN_2 in the enable initial period. After the enable initial period, the enable circuit 212 may provide the second driving current to the voltage driving circuit 211 based on the first enable signal That is, the voltage driving circuit 211 may perform the setup operation based on the first driving current, and generate the internal voltage V_INN based on the second driving current.

FIG. 4 is a diagram illustrating an integrated circuit 400 in accordance with an embodiment. FIG. 4 illustrates an example in which the driving circuit 110 of FIG. 1 is an input buffer circuit 410 to buffer and output input information INF_IN.

Referring to FIG. 4 , the integrated circuit 400 may include the input buffer circuit 410 and an enable control circuit 420.

The input buffer circuit 410 may be configured to buffer to the input information INF_IN based on first and second enable signals EN_1 and EN_2, and output the buffered information as output information INF_OUT. More specifically, the input buffer circuit 410 may include an input driving circuit 411 and an enable circuit 412.

The input driving circuit 411 may be configured to buffer the input information INF_IN. The input information INF_IN may include command information, address information, and data information, which are inputted from outside the input driving circuit 411. The input driving circuit 411 may be implemented in various manners depending on design. The input driving circuit 411 may include all circuits that can receive first and second driving currents and buffer the input information INF_IN, based on the first and second enable signals EN_1 and EN_2.

The enable circuit 412 may be configured to control the enable operation of the input driving circuit 411 based on the first and second enable signals EN_1 and EN_2. More specifically, the enable circuit 412 may include a first NMOS transistor NM1, a second NMOS transistor NM2, and a third NMOS transistor NM3.

The first and second NMOS transistors NM1 and NM2 may be coupled in series between the input driving circuit 411 and a ground voltage terminal VSS. The first NMOS transistor NM1 may have a gate terminal configured to receive the first enable signal EN_1. Thus, the first NMOS transistor NM1 may be turned on or off based on the first enable signal EN_1. The second NMOS transistor NM2 may have a gate terminal configured to receive the second enable signal EN_2. Thus, the second NMOS transistor NM2 may be turned on or off based on the second enable signal EN_2.

The third NMOS transistor NM3 may have drain and source terminals coupled between the ground voltage terminal VSS and the common node of the first and second NMOS transistors NM1 and NM2. The third NMOS transistor NM3 may have a gate terminal configured to receive a bias voltage V_BIA. The third NMOS transistor NM3 may retain a turn-on state based on the bias voltage V_BIA.

As described with reference to FIG. 1 , the first and second enable signals EN_1 and EN_2 may be enabled to overlap each other in the enable initial period. In other words, the first and second NMOS transistors NM1 and NM2 of the enable circuit 412 may be both turned on in the enable initial period. At this time, the third NMOS transistor NM3 may be turned on based on the bias voltage V_BIA. Therefore, the input driving circuit 411 may quickly perform the setup operation using a high driving current in the enable initial period.

Although it will be described below with reference to FIG. 5 , the second enable signal EN_2 may be disabled after the enable initial period. In other words, the second NMOS transistor NM2 may be turned off after the enable initial period. At this time, the third NMOS transistor NM3 may be turned on based on the bias voltage V_BIA. Therefore, the input driving circuit 411 may buffer the input information INF_IN using a low driving current after the enable initial period.

The enable control circuit 420 may be configured to generate the first and second enable signals EN_1 and EN_2 based on a source enable signal EN_S. The enable control circuit 420 may include a delay circuit 421.

The enable control circuit 420 may output the source enable signal EN_S as the first enable signal EN_1. The delay circuit 421 may be configured to delay the first enable signal EN_1 by a preset time, and output the delayed signal as the second enable signal EN_2. The delay circuit 221 may finally generate the second enable signal EN_2 by delaying and inverting the first enable signal EN_1 by the preset time. The preset time may correspond to the setup operation period for the input driving circuit 411.

The preset time of the delay circuit 421 may be controlled based on skew information INF_SQ. The skew information INF_SQ may include characteristic information of the transistors, based on a process, voltage, and temperature which are reflected in the integrated circuit 400. Therefore, the delay circuit 421 may control the setup operation time of the input driving circuit 411 according to the process, voltage, and temperature which are reflected in the integrated circuit 400.

FIG. 5 is a timing diagram illustrating the operation of the enable control circuit 420 of FIG. 4 .

FIG. 5 illustrates the source enable signal the first enable signal EN_1, and the second enable signal EN_2.

Referring to FIGS. 4 and 5 , the source enable signal EN_S may be enabled while transitioning to a logic ‘high’ level from a logic ‘low’ level at which the source enable signal EN_S is disabled. The first enable signal EN_1 may correspond to the source enable signal EN_S. Like the source enable signal EN_S, the first enable signal EN_1 may be enabled while transitioning from a logic ‘low’ level to a logic ‘high’ level. When the first enable signal EN_1 is enabled, the first NMOS transistor NM1 of FIG. 4 may be turned on.

The first enable signal EN_1 may be delayed and inverted by the delay circuit 421 of FIG. 4 , and outputted as the second enable signal EN_2. The second enable signal EN_2 may have an enable period in which the second enable signal EN_2 overlaps the first enable signal EN_1 in the enable initial period. When the second enable signal EN_2 is enabled, the second NMOS transistor NM2 of FIG. 4 may be turned on.

Therefore, the input driving circuit 411 of FIG. 4 may quickly perform the setup operation using a high driving current in the enable period tST in which the first and second enable signals EN_1 and EN_2 overlap each other. That is, the input driving circuit 411 may perform a stable setup operation in the enable period tST. Then, the second NMOS transistor NM2 may be turned off based on the second enable signal EN_2. Therefore, the input driving circuit 411 may normally buffer the input information INF_IN using a low driving current after the stable setup operation.

The integrated circuit 400 in accordance with the present embodiment may secure sufficient driving current at which the input driving circuit 411 can perform the setup operation based on the first and second enable signals EN_1 and EN_2.

FIG. 6 is a circuit diagram illustrating an integrated circuit 600 in accordance with an embodiment.

Referring to FIG. 6 , the integrated circuit 600 may include an input buffer circuit 610 and an enable control circuit 620.

The input buffer circuit 610 may be enabled based on first to fourth enable signals EN_1 to EN_4. The input buffer circuit 610 may be enabled to buffer input information INF_IN, and output the buffered information as output information INF_OUT. Although it will be described below with reference to FIG. 7 , the first and second enable signals EN_1 and EN_2 may have an enable period in which they overlap each other. Furthermore, the third and fourth enable signals EN_3 and EN_4 may have an enable period in which they overlap each other. More specifically, the input buffer circuit 610 may include a first input buffer circuit 611, a second input buffer circuit 612, and an output circuit 613.

The first input buffer circuit 611 may be enabled based on the first and second enable signals EN_1 and EN_2. The first input buffer circuit 611 may perform a setup operation based on a first driving current. The first input buffer circuit 611 may buffer the input information INF_IN based on a second driving current lower than the first driving current. More specifically, the first input buffer circuit 611 may include a first input driving circuit 611_1 and a first enable circuit 611_2.

The first input driving circuit 611_1 may be configured to buffer rising data of the input information INF_IN, which transitions from a logic ‘low’ level to a logic ‘high’ level. The first input driving circuit 611_1 may include first to fourth PMOS transistors PM1 to PM4 and first to fourth NMOS transistors NM1 to NM4, which are configured for a comparison operation and buffer operation for the input information INF_IN and a first reference voltage V_REF1. The first input driving circuit 611_1 may include fifth to seventh PMOS transistors PM5 to PM7 each configured for a reset operation for the corresponding node based on the first enable signal EN_1.

The first enable circuit 611_2 may be configured to control an enable operation of the first input driving circuit 611_1 based on the first and second enable signals EN_1 and EN_2. The first enable circuit 611_2 may include a fifth NMOS transistor NM5, a sixth NMOS transistor NM6, and a seventh NMOS transistor NM7.

The fifth and sixth NMOS transistors NM5 and NM6 may be coupled in series between the first input driving circuit 611_1 and a ground voltage terminal VSS. The fifth NMOS transistor NM5 may have a gate terminal configured to receive the first enable signal EN_1. Thus, the fifth NMOS transistor NM5 may be turned on or off based on the first enable signal EN_1. The sixth NMOS transistor NM6 may have a gate terminal configured to receive the second enable signal EN_2. Thus, the sixth NMOS transistor NM6 may be turned on or off based on the second enable signal EN_2.

The seventh NMOS transistor NM7 may have drain and source terminals coupled between the ground voltage terminal VSS and the common node of the fifth and sixth NMOS transistors NM5 and NM6. The seventh NMOS transistor NM7 may have a gate terminal configured to receive a first bias voltage V_BIA1. The seventh NMOS transistor NM7 may retain a turn-on state based on the first bias voltage V_BIA1.

The first and second enable signals EN_1 and EN_2 may have an enable period in which they overlap each other. Therefore, the first input driving circuit 611_1 may quickly perform the setup operation by using the first driving current as a high driving current in the enable initial period. The first input driving circuit 611_1 may buffer the rising data of the input information INF_IN by using the second driving current as a low driving current, after the enable initial period.

The second input buffer circuit 612 may be enabled based on the third and fourth enable signals EN_3 and EN_4. The second input buffer circuit 612 may perform a setup operation based on a third driving current. The second input buffer circuit 612 may buffer the input information INF_IN based on a fourth driving current lower than the third driving current. More specifically, the second input buffer circuit 612 may include a second input driving circuit 612_1 and a second enable circuit 612_2.

The second input driving circuit 612_1 may be configured to buffer falling data of the input information INF_IN, which transitions from a logic ‘high’ level to a logic ‘low’ level. The second input driving circuit 612_1 may include eighth to 11th PMOS transistors PM8 to PM11 and eighth to 11th NMOS transistors NM8 to NM11, which are configured for a comparison operation and buffer operation for the input information INF_IN and a second reference voltage V_REF2. The second input driving circuit 612_1 may include a 12 PMOS transistor PM12 and 12th and 13th NMOS transistors NM12 and NM13, which are each configured to perform a reset operation on the corresponding node, based on the first and third enable signals EN_1 and EN_3.

The second enable circuit 612_2 may be configured to control an enable operation of the second input driving circuit 612_1 based on the third and fourth enable signals EN_3 and EN_4. The second enable circuit 612_2 may include a 13th PMOS transistor PM13, a 14th PMOS transistor PM14, and a 15th PMOS transistor PM15.

The 13th and 14th PMOS transistors PM13 and PM14 may be coupled in series between a supply voltage terminal VDD and the second input driving circuit 612_1. The 13th PMOS transistor PM13 may have a gate terminal configured to receive the fourth enable signal EN_4. Thus, the 13th PMOS transistor PM13 may be turned on or off based on the fourth enable signal EN_4. The 14th PMOS transistor PM14 may have a gate terminal configured to receive the third enable signal EN_3. Thus, the 14th PMOS transistor PM14 may be turned on or off based on the third enable signal EN_3.

The 15th PMOS transistor PM15 may have drain and source terminals coupled between the supply voltage terminal VDD and the common node of the 13th and 14th PMOS transistors PM13 and PM14. The 15th PMOS transistor PM15 may have a gate terminal configured to receive a second bias voltage V_BIA2. The 15th PMOS transistor PM15 may retain a turn-on state based on the second bias voltage V_BIA2.

The third and fourth enable signals EN_3 and EN_4 may have an enable period in which they overlap each other. Therefore, the second input driving circuit 612_1 may quickly perform the setup operation by using the third driving current as a high (a large amount of) driving current, in the enable initial period. The second input driving circuit 612_1 may buffer the falling data of the input information INF_IN by using the fourth driving current as a low (a small amount of) driving current, after the enable initial period.

The output circuit 613 may be configured to output the output information INF_OUT corresponding to output signals of the first and second input buffer circuits 611 and 612. The output circuit 613 may include a transmission gate TG and first and second inverting gates INV1 and INV2.

The transmission gate TG may be turned on or off based on the first and third enable signals EN_1 and EN_3. The first and second inverting gates INV1 and INV2 may be coupled in series, and output an output signal of the transmission gate TG as output information INV_OUT.

The enable control circuit 620 may be configured to generate the first to fourth enable signals EN_1 to EN_4. The first enable signal EN_1 may be enabled in response to a buffering operation period and a setup operation period of the first input buffer circuit 611. The second enable signal EN_2 may be enabled in response to the setup operation period of the first input buffer circuit 611. The third enable signal EN_3 may be enabled in response to a buffering operation period and a setup operation period of the second input buffer circuit 612. The fourth enable signal EN_4 may be enabled in response to the setup operation period of the second input buffer circuit 612. More specifically, the enable control circuit 620 may include third to eighth inverting gates INV3 to INV8.

The third inverting gate INV3 may generate the third enable signal EN_3 by receiving and inverting the first enable signal EN_1. The fourth to seventh inverting gates INV4 to INV7 may be coupled in series as a delay circuit. The fourth to seventh inverting gates INV4 to INV7 may generate the second enable signal EN_2 by delaying the third enable signal EN_3 by a preset time. The eighth inverting gate INV8 may generate the fourth enable signal EN_4 by receiving and inverting the second enable signal EN_2.

In other words, the fourth to seventh inverting gates INV4 to INV7 serving as a delay circuit may generate the second enable signal EN_2 by delaying the first enable signal EN_1 by the preset time, and generate the fourth enable signal EN_4 by delaying the third enable signal EN_3 by the preset time.

FIG. 7 is a timing diagram illustrating the operation of the enable control circuit 620 of FIG. 6 .

FIG. 7 illustrates the first enable signal EN_1, the second enable signal EN_2, the third enable signal EN_3, and the fourth enable signal EN_4.

Referring to FIG. 7 , the first and second enable signals EN_1 and EN_2 may have an enable period in which they overlap each other. Furthermore, the third and fourth enable signals EN_3 and EN_4 may have an enable period in which they overlap each other. At this time, the first and third enable signals EN_1 and EN_3 may have an inverse relationship, and the second and fourth enable signals EN_2 and EN_4 may have an inverse relationship.

Therefore, the first input buffer circuit 611 of FIG. 6 may quickly perform the setup operation using a high driving current in an enable period tST in which the first and second enable signals EN_1 and EN_2 overlap each other. Furthermore, the second input buffer circuit 612 may quickly perform the setup operation using a high driving current in an enable period tST in which the third and fourth enable signals EN_3 and EN_4 are enabled to overlap each other. Furthermore, the input buffer circuit 610 may normally buffer the input information INF_IN using a low driving current after the stable setup operation.

The integrated circuit 600 may secure sufficient driving current at which the first and second input buffer circuits 611 and 612 can perform the setup operation based on the first to fourth enable signals EN_1 to EN_4.

FIG. 8 is a flowchart illustrating an operation method 800 of an integrated circuit in accordance with an embodiment.

Referring to FIG. 8 , the operation method 800 of the integrated circuit may include step S810 of performing a setup operation and step S820 of performing a driving operation.

Step S810 of performing the setup operation may include performing the setup operation using a first driving current in an enable initial period. As already described above, the integrated circuit 100 of FIG. 1 , for example, may perform the setup operation using a high driving current in the enable period where the first and second enable signals EN_1 and EN_2 overlap each other.

Step S820 of performing the driving operation may include performing a preset driving operation using a second driving current lower than the first driving current, after the setup operation. The preset driving operation may be an operation of generating the internal voltage V_INN described with reference to FIG. 2 or an operation of buffering the input information INF_IN described with reference to FIGS. 4 and 6 .

The operation method 800 of the integrated circuit in accordance with the present embodiment may quickly perform the setup operation using the first driving current, and reduce or minimize the power consumption using the second driving current.

In accordance with the present embodiment, the integrated circuit and the operation method thereof can quickly perform the setup operation in the enable initial period based on the enable signal, thereby achieving more stable circuit operation.

While various embodiments have been described above, it will be understood by those skilled in the art that the embodiments is described represent examples only. Accordingly, the integrated circuit and the operation method thereof, which are described herein, should not be limited based on the described embodiments. 

What is claimed is:
 1. An integrated circuit comprising: a driving circuit enabled based on a first enable signal and a second enable signal, and configured to perform a setup operation based on a first driving current and perform a preset operation based on a second driving current lower than the first driving current; and an enable control circuit configured to generate the first and second enable signals.
 2. The integrated circuit according to claim 1, wherein the first enable signal is enabled during a setup operation period and a preset operation period, and the second enable signal is enabled during the setup operation period.
 3. The integrated circuit according to claim 1, wherein the driving circuit includes an internal voltage generation circuit configured to generate an internal voltage, wherein the internal voltage generation circuit comprises: a voltage driving circuit configured to generate the internal voltage; and an enable circuit configured to control an enable operation of the voltage driving circuit based on the first and second enable signals.
 4. The integrated circuit according to claim 3, wherein the enable control circuit is configured to output, as the first enable signal, a source enable signal for controlling the enable operation of the internal voltage generation circuit, and the enable control circuit comprises: a delay circuit configured to delay the first enable signal by a preset time, and output the delayed signal; and an output circuit configured to receive the first enable signal and the output signal of the delay circuit, and output the second enable signal having a pulse width corresponding to the preset time.
 5. The integrated circuit according to claim 4, wherein the preset time corresponds to a setup operation period of the voltage driving circuit.
 6. The integrated circuit according to claim 4, wherein the delay circuit is capable of controlling the preset time based on skew information.
 7. The integrated circuit according to claim 1, wherein the driving circuit comprises an input buffer circuit configured to buffer input information and output the buffered information, wherein the input buffer circuit comprises: an input driving circuit configured to buffer the input information; and an enable control circuit configured to control an enable operation of the input driving circuit based on the first and second enable signals.
 8. The integrated circuit according to claim 7, wherein the enable control circuit comprises a delay circuit configured to: output the source enable signal as the first enable signal; delay the first enable signal by a preset time; and output the delayed signal as the second enable signal.
 9. The integrated circuit according to claim 8, wherein the preset time corresponds to a setup operation period of the input driving circuit.
 10. The integrated circuit according to claim 8, wherein the delay circuit is capable of controlling the preset time based on skew information.
 11. The integrated circuit according to claim 1, wherein the second enable signal is enabled in an enable initial period, and the first enable signal is enabled after the enable initial period.
 12. An integrated circuit comprising: a first input buffer circuit capable of being enabled based on a first enable signal and a second enable signal, the first input buffer circuit configured to perform a setup operation based on a first driving current and buffer input information based on a second driving current lower than the first driving current; a second input buffer circuit capable of being enabled based on a third enable signal and a fourth enable signal, the second input buffer circuit configured to perform a setup operation based on a third driving current and buffer falling data of the input information based on a fourth driving current lower than the third driving current; an output circuit configured to output output information corresponding to output signals of the first and second input buffer circuits; and an enable control circuit configured to generate the first, second, third, and fourth enable signals.
 13. The integrated circuit according to claim 12, wherein the first and second enable signals have an enable period in which the first and second enable signals overlap each other, and the third and fourth enable signals have an enable period in which the third and fourth enable signals overlap each other.
 14. The integrated circuit according to claim 12, wherein the first input buffer circuit is configured to buffer rising data of the input information, and the second input buffer circuit is configured to buffer falling data of the input information.
 15. The integrated circuit according to claim 12, wherein the first input buffer circuit comprises: a first input driving circuit configured to buffer the input information; and a first enable circuit configured to control an enable operation of the first input driving circuit based on the first and second enable signals.
 16. The integrated circuit according to claim 12, wherein the second input buffer circuit comprises: a second input driving circuit configured to buffer the input information; and a second enable circuit configured to control an enable operation of the second input driving circuit based on the third and fourth enable signals.
 17. The integrated circuit according to claim 12, wherein the enable control circuit comprises a delay circuit configured to: delay the first and third enable signals by a preset time; and output the delayed signals as the second and fourth enable signals.
 18. An operation method of an integrated circuit, the method comprising: performing a setup operation using a first driving current in an enable initial period; and performing a preset driving operation using a second driving current lower than the first driving current, after the setup operation.
 19. The operation method according to claim 18, further comprising generating a first enable signal and a second enable signal, wherein the setup operation is performed in an enable period where the first and second enable signals overlap each other.
 20. The operation method according to claim 18, further comprising generating a first enable signal and a second enable signal, wherein: the second enable signal enabled in the enable initial period, and the first enable signal is enabled after the enable initial period. 